Here is the full list of all 52 Immortal Empire achievements.
Equip one immortal with all enchanted gear
Kill Vuldreth on brutal difficulty
Reach 5,000 kills without dying
Reach 500,000 gold
Buy an item for at least 100,000 gold
Equip 1 immortal full with items
Craft your first phrase or verse out of glyphs
Acquire your first rune
Reach 5,000 radiance
Get the highest possible romance score
Reach the maximum possible charisma attribute
Get the lowest possible romance score
Find a black crystal
Solve the mystery in Ashen Plateau
Win 25 ladder versus matches
Kill Vuldreth on hard difficulty
Reach the maximum immortal level
Complete a level without taking damage
Complete a level using only magic
Kill Vuldreth
Reach the maximum number of profile attributes
Reach the maximum possible perception attribute
Kill Raek
Kill Berelorn
Kill Junji
Reveal an entire map
Deal 500 damage with a single attack
Find your first mythical item
Survive a turn with only 1 hit point remaining
Play your first versus match
Have 5 buffs active on an immortal at once
Control 5 immortals
Purchase your first radiance item
Purchase your first store item
Enchant your first item
Complete the gauntlet on any difficulty
Complete every level challenge
Kill 5 enemies with a single spell
Kill Buono
Unlock first new area
Find your first divine item
Complete a level using only physical attacks
Complete a level with a co-op partner
Acquire your first charm
Defeat your first gauntlet level
Complete a level without killing anything
Reach the maximum possible wisdom attribute
Reach the maximum possible will attribute
Complete a level without startling any enemy
Complete the gauntlet on immortal difficulty
Reach 100% achievements and challenges
Kill Vuldreth on insane difficulty